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时间:2020-05-22
《高墩大跨桥梁多自由度拟动力试验设计分析及试验验证-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2014年第44卷第4期(总第227期)68BridgeConstruction,Vo1.44,No.4,2014(TotallyNo.227)文章编号:1003—4722(2014)04—0068—07高墩大跨桥梁多自由度拟动力试验设计分析及试验验证刘红彪,刘现鹏,张强(交通运输部天津水运工程科学研究所,天津300456)摘要:为改善高墩等质量连续分布体系单自由度拟动力试验的精度,以牛栏江大桥为例对该类结构的多自由度拟动力试验进行研究,并对加载模型进行合理减化。通过多自由度结构动力反应分析理论、高柔
2、结构地震反应数值计算及桥梁简化模型的振动台试验,分析高阶振型对高墩大跨桥梁地震反应的影响。结果表明:对于高柔结构,采用等效单自由度体系的拟动力试验的位移结果是准确的;高阶振型对高墩大跨桥梁等高柔结构地震反应的基底剪力和基底弯矩影响较大,影响程度与地震波的频谱特性有关;在特定地震动作用下,2阶振型会对高柔结构的基底弯矩和基底剪力起主要贡献,故百米级高墩的拟动力试验等效为2自由度体系进行加载是合适的,若采用等效单自由度体系进行试验,应变及试验现象可能与实际不符。关键词:高墩大跨桥梁;高柔结构;多自由度;拟动力试验
3、;振动台试验;高阶振型;地震反应中图分类号:U442.55;U448.14文献标志码:AAnalysisandTestVerificationofMDOFPseudo。·DynamicTestDesignofLongSpanBridgewithHigh·-RisePiersLIUHong—biao,LIUXian—peng,ZHANGQiang(TianjinResearchInstituteforWaterTransportEngineering,MinistryofTransport,Tianjin300
4、456,China)Abstract:Toimprovetheaccuracyofthesingle—degree—of-freedompseudo—dynamictestforthecontinuousdistributionsystemwithhigh—risepiersandequivalentmass,theNiulanRiverBridge,alongspanbridgewithhigh—risepiers,wastakenasanexample,themulti—degree—of—freedom
5、(MD0F)pseudo—dynamictestforthebridgeofthesamekindwasstudiedandthetestloadingmodelwasrationallysimplified.Theinfluencesofthehigh—ordervibrationmodesontheseismicresponsesoftheexamplebridgewereanalyzed,usingthedynamicresponseanalysistheo—ryfortheMDOFstructure,
6、theseismicresponsenumericalcalculationforthehigh—riseandflexiblestructureandtheshakingtabletestforthebridgesimplifiedloadingmode1.Theresultsoftheanalysisdemonstratethatforthehigh—riseandflexiblestructure。thestructuraldisplacementre—suitsobtainedfromthepseud
7、o—dynamictestoftheequivalentsingle—degree—of——freedomsystemarecorrect.Intheseismicresponsesofthehigh—riseandflexiblestructurelikethelongspanbridgewithhigh—risepiers,theinfluencesofthehigh—ordervibrationmodesonthebaseshearforcesandbasemomentofthestructureare
8、greatandthedegreesoftheinfluencesareassociatedwiththecharacteristicsoftheseismicwavefrequencyspectra.Undertheactionofthegivengroundmo—tion,thesecond—ordervibrationmodewillmakeamajorcontributiontothebas
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